It's hard to resist those big, expressive puppy eyes. But when tears or redness in your dog's eyes makes you worry, Kristina Vygantas, DVM at NorthStar VETS and diplomate, American College of Veterinary Ophthalmologists, has expert tips for what to do. When you understand the causes and symptoms of dog eye infections, you'll know how to help your precious pet. Plus, Vygantas shares how to treat dog eye infections and prevent them in the first place. Dog eye infections have a wide range of causes.